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Preparation method of positively charged hyperfiltration membrane and products thereof

An ultrafiltration membrane, positively charged technology, applied in the field of preparation of positively charged ultrafiltration membranes, can solve the problems of high cost, high toxicity, difficult recycling and the like, and achieves improved anti-pollution performance, stable positive charging performance, The effect of prolonging the service life

Inactive Publication Date: 2009-02-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method adopts a one-step method to improve the efficiency, the solvent chlorobenzene and non-solvent ethanol used in the production process are highly toxic substances, and it is not easy to recycle, and the cost is high

Method used

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  • Preparation method of positively charged hyperfiltration membrane and products thereof
  • Preparation method of positively charged hyperfiltration membrane and products thereof
  • Preparation method of positively charged hyperfiltration membrane and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Use N-methylpyrrolidone as solvent and triethanolamine as amination reagent to prepare positively charged asymmetric membrane:

[0044] (1) Preparation of casting solution:

[0045] Take 4.2g of benzyl brominated polyphenylene ether and dissolve it in 14.7ml of N-methylpyrrolidone (NMP). After the benzyl brominated polyphenylene ether is completely dissolved, add 0.77ml of polyethylene glycol (PEG-400) To control the porosity of the resulting membrane (the amount added is no more than 10% of the total mass of the casting solution), and stirred into a homogeneous solution;

[0046] (2) In-situ amination reaction of casting solution and triethanolamine:

[0047] In the above homogeneous solution, while stirring, a 3.0mol / L triethanolamine NMP solution was added dropwise to it. At this time, the triethanolamine reacted with the benzyl-substituted bromine on the polyphenylene ether to quaternize the membrane material. Positively charged. The molar ratio of the bromine in...

Embodiment 2～4

[0053] Effects of different polyethylene glycol (PEG-400) additions on the prepared positively charged membrane:

[0054] (1) Preparation of casting solution:

[0055] Take 4.2g of benzyl brominated polyphenylene ether and dissolve it in 14.7ml of N-methylpyrrolidone (NMP). After the benzyl brominated polyphenylene ether is completely dissolved, add the additive polyethylene glycol. The amount of polyethylene glycol added It is limited to no more than 10% of the total mass of the casting solution, see Table 1 for details;

[0056] (2) In-situ amination reaction of casting solution and triethanolamine:

[0057] In the above homogeneous solution, while stirring, add the amination reagent triethanolamine to it, and the molar ratio of the bromine in the repeating unit of benzyl brominated polyphenylene ether to the amine in the amination reagent triethanolamine is 8:1. Control the amount of triethanolamine; after the stirring is completed, put it into a water bath at 55°C to rea...

Embodiment 5～7

[0064] Using N-methylpyrrolidone / tetrahydrofuran as a mixed solvent, the influence of different mixing ratios on the prepared positively charged membrane:

[0065] (1) Preparation of casting solution:

[0066] Take 4.2g of benzyl brominated polyphenylene ether and dissolve in 14.7ml of a mixed solvent of N-methylpyrrolidone and tetrahydrofuran, wherein the volume ratio of N-methylpyrrolidone and tetrahydrofuran is shown in Table 2. After completely dissolving, add polyethylene glycol (PEG-400) of 2% of the total mass of the casting liquid, and stir to form a homogeneous solution;

[0067] (2) In-situ amination reaction of casting solution and triethanolamine:

[0068] In the above homogeneous solution, while stirring, add the amination reagent triethanolamine to it, and the molar ratio of the bromine in the repeating unit of benzyl brominated polyphenylene ether to the amine in the amination reagent triethanolamine is 8:1. Control the amount of triethanolamine; after the sti...

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Abstract

The invention relates to a method for preparing a positively charged ultrafiltration membrane. Benzyl bromide polyphenylene ether is dissolved in a good solvent to prepare a film-casting solution, then an aminating reagent is added into the film-casting solution to carry out reaction, and the film-casting solution after the reaction and defoaming is turned into the membrane by wet-dry phase inversion; wherein, the good solvent is N-methyl pyrrolidone or a mixed solvent of the N-methyl pyrrolidone and tetrahydrofuran, and the aminating reagent is triethanolamine. The method has the advantages that: the membrane forming material of the method functionalizes positive charge and forms the membrane by one-time operation by phase conversion, therefore, bischloromethyl ether which is a strongly carcinogenic substance is avoided; the hydrophilicity of the membrane can be improved because triethanolamine contains three alcoholic hydroxyls, therefore, the antipollution property is high, the positively charged performance is stable and the membrane is acid and alkali resistant; the coagulation bath uses water and quaternary amination is carried out to amine and the benzyl bromide polyphenylene ether solution under mild condition to obtain positive charge, therefore, the method has the potential for large scale industrialized production; the compact degree and morphological structure of the membrane are controllable; the retention rate to a 0.5g / l BSA aqueous solution can reach more than 90 percent.

Description

technical field [0001] The invention belongs to the technical field of polymer membranes, and specifically relates to a preparation method and a product of a positively charged ultrafiltration membrane. Background technique [0002] Modern polymer membrane separation technology has a history of thirty years. In recent years, due to the characteristics of less energy consumption, high efficiency, less land occupation and no pollution, membrane separation has become one of the key areas of scientific and technological development at home and abroad. According to the pore size of the membrane and their molecular weight cut-off, the membrane can be divided into microfiltration, ultrafiltration, nanofiltration, and reverse osmosis membranes. The general membrane filtration separation process is based on a physical sieving principle, which allows components smaller than its pore size to pass through and intercepts components larger or similar to its particle size. Obviously, if ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/52B01D71/82
Inventor 高莉汤蓓蓓武培怡
Owner FUDAN UNIV
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